As long as there have been mice,people have sought a better mousetrap.这句话不懂.

题目

As long as there have been mice,people have sought a better mousetrap.这句话不懂.
As long as there have been mice,people have sought a better mousetrap.这句话为什么用现在完成时?

答案

只要这里已经有老鼠了,人们就会寻找更好的扑鼠器
have been 完成时,表示一直,已经